Mail app automatically entering one of my configured accounts
I have three email accounts: two Exchange and one GMail configured. When I press the Mail icon, the application goes directly into one of the account's inbox. It is that account's Inbox and not the All Inboxes as the upper left has the account name 'back' button to return to the accounts folder list.
I removed all email accounts and re-added them. Same thing started happening. I restored the phone back to factory settings and re-added all accounts. This helped for a while but it started doing it again.
If I back out to the main Mail screen with the account listing and leave it there in about 15 seconds it enters an inbox on its own. Very odd. It seems to be the Gmail account that it enters but when I remove that account - it just does it to another account.
Any thoughts.
Mac Air, Mac OS X (10.6.6), iPhone 3GS 16G